Carbides; of silicon, whether or not chemically defined

HS code 284920 covers the classification of silicon carbide, a versatile and widely-used industrial material. Silicon carbide is a ceramic compound known for its exceptional hardness, thermal conductivity, and resistance to wear and corrosion. It finds extensive applications across various industries, including abrasives, refractories, electronics, and advanced ceramics, making it an essential component in the global manufacturing landscape.

The production of silicon carbide typically involves a high-temperature carbothermic reduction process. This process combines silicon dioxide (sand) and carbon (typically in the form of petroleum coke or coal) in an electric arc furnace, where temperatures can reach up to 2,500°C (4,532°F). The intense heat facilitates the chemical reaction, resulting in the formation of crystalline silicon carbide. The raw material is then crushed, graded, and processed to meet specific industry requirements.

The primary inputs for the production of silicon carbide include silicon dioxide (sand), carbon sources (such as petroleum coke or coal), and significant amounts of electrical energy to power the high-temperature furnaces. Additionally, specialized equipment, such as electric arc furnaces, crushing and grinding machinery, and purification systems, are essential for the manufacturing process.

The primary output of HS code 284920 is silicon carbide, which can be further processed and utilized in a wide range of applications. Silicon carbide finds use as an abrasive material in cutting tools, grinding wheels, and polishing compounds 820600 Cutlery, tools, and similar articles. It is also used in the production of refractory materials, such as furnace linings and crucibles 690310 Refractory bricks, blocks, tiles, and similar refractory ceramic constructional goods, as well as in the manufacture of semiconductors and other electronic components 854430 Ignition wiring sets and other wiring sets for vehicles, aircraft or ships.